'use strict';

// Do this as the first thing so that any code reading it knows the right env.
process.env.BABEL_ENV = 'test';
process.env.NODE_ENV = 'test';
process.env.PUBLIC_URL = '';

// Makes the script crash on unhandled rejections instead of silently
// ignoring them. In the future, promise rejections that are not handled will
// terminate the Node.js process with a non-zero exit code.
process.on('unhandledRejection', err => {
	throw err;
});

// Ensure environment variables are read.
require('../config/env');

const jest = require('jest');
const execSync = require('child_process').execSync;
const argv = process.argv.slice(2);

function isInGitRepository() {
	try {
		execSync('git rev-parse --is-inside-work-tree', {stdio: 'ignore'});
		return true;
	} catch (error) {
		return false;
	}
}

function isInMercurialRepository() {
	try {
		execSync('hg --cwd . root', {stdio: 'ignore'});
		return true;
	} catch (error) {
		return false;
	}
}

// Watch unless on CI or explicitly running all tests
if (
	!process.env.CI &&
  !argv.includes('--watchAll') &&
  !argv.includes('--watchAll=false')
) {
	// https://github.com/facebook/create-react-app/issues/5210
	const hasSourceControl = isInGitRepository() || isInMercurialRepository();
	argv.push(hasSourceControl ? '--watch' : '--watchAll');
}

jest.run(argv);
